Please help! Giving brainliest answer! A baseball diamond is a square with side 90 feet. A batter hits the ball and runs toward first base with a speed of 21 It/s.
90 ft
(a) At what rate (In fus) is his distance from second base decreasing when he is halfway to first base? (Round your answer to one decimal place.)
(6) At what rate (in ft/s) is his distance from third base increasing at the same moment? (Round your answer to one decimal place.)
US

Here is their argument. given the obtuse angle x, we make a quadrilateral abcd with ∠dab = x, and ∠abc = 90◦, and ad = bc. say the perpendicular bisector to dc meets the perpendicular bisector to ab at p. then pa = pb and pc = pd. so the triangles pad and pbc have equal sides and are congruent. thus ∠pad = ∠pbc. but pab is isosceles, hence ∠pab = ∠pba. subtracting, gives x = ∠pad−∠pab = ∠pbc −∠pba = 90◦. this is a preposterous conclusion – just where is the mistake in the "proof" and why does the argument break down there?

Given the diagram below, michael writes, "segment ac is congruent to segment ac." which of the following reasons allow him to write this statement?

The data set represents the ages of players in a chess club. 27, 34, 38, 16, 22, 45, 54, 60. what is the mean absolute deviation of the data set?